Kelly Clarkson poses for the February issue of 'Cosmopolitan' magazine, out Jan. 8. / Marc Horn

by Ann Oldenburg, USA TODAY

by Ann Oldenburg, USA TODAY

She's had fame and success, sold millions of records and concert tickets. But it was finding Brandon Blackstock that really changed Kelly Clarkson's life.

"I've never been truly loved like I am right now," says the original American Idol in an interview in the February issue of Cosmopolitan.

"When I hit 30, I was like 'I don't have a problem right now. There's nothing to work out. What am I going to do with my time?' Some people worry about getting older, but my life is getting easier, so I love it."

Her fiance, she says is "totally the one. I've never been so happy."

But she does mention that she has gotten sexual offers through the years, including from from lesbians.

"People think, 'Oh, she's been single for too long.' That's kind of an insult to the gay community. Being single doesn't mean you're gay. But I'm never insulted by it. I mean, I get hit on by the hottest girls ever. Oh my god, If I was a lesbian, I would be so in luck. But it's just not my thing. I've always batted for the boys' team."

As for her weight, a constant topic of conversation, Clarkson says, "One magazine said I lost 40 pounds-that's a small child, by the way. I lost 18 pounds. And I think that happens when you fall in love or date someone. If I'm going to be kissing or messing around, I gotta look good. There's not a fad diet."

She continues, "I was working with a trainer, and she said, 'You'd be amazed the amount of weight you can drop by halving your portions. I know it sounds crazy, but do it for two weeks and watch what happens.' I just cut back my portions, I stopped eating late at night, and I work out a little more than I used to, and I literally dropped 18 pounds in a month. I think it happens when you get really busy as well. But when I'm on my off-time-girl, those 18 might come back."